<template>
    <div id="aCoursesList" class="bg-fa of">
        <!-- /课程列表 开始 -->
        <section class="container">
            <header class="comm-title">
                <h2 class="fl tac">
                    <span class="c-333">全部课程</span>
                </h2>
            </header>
            <section class="c-sort-box">
                <section class="c-s-dl">
                    <dl>
                        <dt>
                            <span class="c-999 fsize14">课程类别</span>
                        </dt>
                        <dd class="c-s-dl-li">
                            <ul class="clearfix">
                                <li>
                                    <a title="全部" href="#">全部</a>
                                </li>
                                <li v-for="(item,index) in subjectNestedList" :key="index"
                                    :class="{active:oneIndex==index}">
                                    <a :title="item.title" href="#" @click="searchOne(item.id,index)">{{item.title}}</a>
                                </li>

                            </ul>
                        </dd>
                    </dl>
                    <dl>
                        <dt>
                            <span class="c-999 fsize14"></span>
                        </dt>
                        <dd class="c-s-dl-li">
                            <ul class="clearfix">
                                <li v-for="(item,index) in subSubjectList" :key="index"
                                    :class="{active:twoIndex==index}">
                                    <a :title="item.title" href="#" @click="searchTwo(item.id,index)">{{item.title}}</a>
                                </li>

                            </ul>
                        </dd>
                    </dl>
                    <div class="clear"></div>
                </section>
                <div class="js-wrap">
                    <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
                    </section>
                    <section class="fl">
                        <ol class="js-tap clearfix">
                            <li :class="{'current bg-orange':buyCountSort!=''}">
                                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
                                    <span :class="{hide:buyCountSort==''}">↓</span>
                                </a>
                            </li>
                            <li :class="{'current bg-orange':gmtCreateSort!=''}">
                                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
                                    <span :class="{hide:gmtCreateSort==''}">↓</span>
                                </a>
                            </li>
                            <li :class="{'current bg-orange':priceSort!=''}">
                                <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
                                    <span :class="{hide:priceSort==''}">↓</span>
                                </a>
                            </li>
                        </ol>
                    </section>
                </div>
                <div class="mt40">
                    <!-- /无数据提示 开始-->
                    <section class="no-data-wrap" v-if="data.total==0">
                        <em class="icon30 no-data-ico">&nbsp;</em>
                        <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
                    </section>
                    <!-- /无数据提示 结束-->
                    <article v-if="data.total>0" class="comm-course-list">
                        <ul class="of" id="bna">
                            <li v-for="item in data.items" :key="item.id">
                                <div class="cc-l-wrap">
                                    <section class="course-img">
                                        <img :src="item.cover" class="img-responsive" :alt="item.title">
                                        <div class="cc-mask">
                                            <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                                        </div>
                                    </section>
                                    <h3 class="hLh30 txtOf mt10">
                                        <a :href="'/course/'+item.id" :title="item.title"
                                           class="course-title fsize18 c-333">{{item.title}}</a>
                                    </h3>
                                    <section class="mt10 hLh20 of">
                    <span v-if="Number(item.price) === 0" class="fr jgTag bg-green">
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                                        <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">9634人学习</i>
                      |
                      <i class="c-999 f-fA">9634评论</i>
                    </span>
                                    </section>
                                </div>
                            </li>

                        </ul>
                        <div class="clear"></div>
                    </article>
                </div>
                <!-- 公共分页 开始 -->
                <div>
                    <div class="paging">
                        <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
                        <a
                            :class="{undisable: !data.hasPrevious}"
                            href="#"
                            title="首页"
                            @click.prevent="gotoPage(1)">首</a>
                        <a
                            :class="{undisable: !data.hasPrevious}"
                            href="#"
                            title="前一页"
                            @click.prevent="gotoPage(data.current-1)">&lt;</a>
                        <a
                            v-for="page in data.pages"
                            :key="page"
                            :class="{current: data.current == page, undisable: data.current == page}"
                            :title="'第'+page+'页'"
                            href="#"
                            @click.prevent="gotoPage(page)">{{ page }}</a>
                        <a
                            :class="{undisable: !data.hasNext}"
                            href="#"
                            title="后一页"
                            @click.prevent="gotoPage(data.current+1)">&gt;</a>
                        <a
                            :class="{undisable: !data.hasNext}"
                            href="#"
                            title="末页"
                            @click.prevent="gotoPage(data.pages)">末</a>
                        <div class="clear"/>
                    </div>
                </div>
            </section>
        </section>
        <!-- /课程列表 结束 -->
    </div>
</template>
<script>
    import courseApi from '@/api/course'

    export default {
        data() {
            return {
                page: 1, //当前页
                data: {},  //课程列表
                subjectNestedList: [], // 一级分类列表
                subSubjectList: [], // 二级分类列表

                searchObj: {}, // 查询表单对象

                oneIndex: -1,
                twoIndex: -1,
                buyCountSort: "",
                gmtCreateSort: "",
                priceSort: ""
            }
        },
        created() {
            //课程第一次查询
            this.initCourseFirst()
            //一级分类显示
            this.initSubject()
        },
        methods: {
            //1、查询第一页数据
            initCourseFirst() {
                courseApi.getCourseList(1, 8, this.searchObj).then(response => {
                    this.data = response.data.data
                })
            },
            //2、查询所有一级分类
            initSubject() {
                courseApi.getAllSubject()
                    .then(response => {
                        this.subjectNestedList = response.data.data.list
                    })
            },
            //3、分页切换的方法
            gotoPage(page) {
                courseApi.getCourseList(page, 8, this.searchObj).then(response => {
                    this.data = response.data.data
                })
            },
            //4、点击某个一级分类，查询对应二级分类
            searchOne(subjectParentId, index) {
                //把传递index值赋值给oneIndex,为了active样式生效
                this.oneIndex = index

                this.twoIndex = -1
                this.searchObj.subjectId = ""
                this.subSubjectList = []

                //把一级分类点击id值，赋值给searchObj
                this.searchObj.subjectParentId = subjectParentId
                //点击某个一级分类进行条件查询
                this.gotoPage(1)

                //拿着点击一级分类id 和 所有一级分类id进行比较，
                //如果id相同，从一级分类里面获取对应的二级分类
                for (let i = 0; i < this.subjectNestedList.length; i++) {
                    //获取每个一级分类
                    var oneSubject = this.subjectNestedList[i]
                    //比较id是否相同
                    if (subjectParentId == oneSubject.id) {
                        //从一级分类里面获取对应的二级分类
                        this.subSubjectList = oneSubject.children
                    }
                }
            },
            //5、点击某个二级分类实现查询
            searchTwo(subjectId, index) {
                //把index赋值,为了样式生效
                this.twoIndex = index
                //把二级分类点击id值，赋值给searchObj
                this.searchObj.subjectId = subjectId
                //点击某个二级分类进行条件查询
                this.gotoPage(1)
            },
            //6、根据销量排序
            searchBuyCount() {
                //设置对应变量值，为了样式生效
                this.buyCountSort = "1"
                this.gmtCreateSort = ""
                this.priceSort = ""

                //把值赋值到searchObj
                this.searchObj.buyCountSort = this.buyCountSort
                this.searchObj.gmtCreateSort = this.gmtCreateSort;
                this.searchObj.priceSort = this.priceSort;

                //调用方法查询
                this.gotoPage(1)
            },
            //7、最新排序
            searchGmtCreate() {
                //设置对应变量值，为了样式生效
                this.buyCountSort = ""
                this.gmtCreateSort = "1"
                this.priceSort = ""

                //把值赋值到searchObj
                this.searchObj.buyCountSort = this.buyCountSort
                this.searchObj.gmtCreateSort = this.gmtCreateSort;
                this.searchObj.priceSort = this.priceSort;

                //调用方法查询
                this.gotoPage(1)
            },
            //8、价格排序
            searchPrice() {
                //设置对应变量值，为了样式生效
                this.buyCountSort = ""
                this.gmtCreateSort = ""
                this.priceSort = "1"

                //把值赋值到searchObj
                this.searchObj.buyCountSort = this.buyCountSort
                this.searchObj.gmtCreateSort = this.gmtCreateSort;
                this.searchObj.priceSort = this.priceSort;

                //调用方法查询
                this.gotoPage(1)
            }
        }
    };
</script>
<style scoped>
    .active {
        background: #bdbdbd;
    }

    .hide {
        display: none;
    }

    .show {
        display: block;
    }
</style>
